In this section you will find a detailed guide to Effort Values and how they will make your Pokemon stronger.
There are also a set of berries that will reduce your Pokemon's EVs. They are useful if you miscount EVs or simply want to change the EV distribution. All the berries can be obtained from the Berry Master on Route 208:
If you have over 100 EVs in a stat, the first berry will reduce them to 100, while further berries will decrease the EVs by 10. Therefore if you want to remove all EVs you will need 11 berries for the stat.
You can often max out the EVs by level 20, which leaves the Pokemon free for use in-game; it will also be stronger than normal.
Don't lose Pokerus.
If your Pokemon get the Pokerus, always keep a few with the virus in the PC to pass on to future Pokemon you wish to train.
Use vitamins early.
If you decide to use vitamins, use them straight away since they only work for the first 100 EVs.
Use the Poketech
Counter app to count how many EVs you earn after each battle. Don't forget to include modifications from items/PKRS. The count is reset as soon as you switch apps or turn off your game, so write it down before quitting.
Spread EVs out a little.
Many guides you will see will tell you to max out your EVs in two stats (e.g. Attack and Speed) and forget about the rest. But this can leave some vulnerabilites.
With Speed, unless you're Jolteon, you're not going to be able to out-run everyone (and you don't need to), so try saving some EVs for other stats.
Maximize HP×Def and/or HP×SpDef.
The damage your Pokemon takes is calculated using the product of HP and the appropriate Defense stat. Therefore, for defensive EV spreads, you should put more EVs into the lower stat.
Snorlax, for example, has a high HP and so-so Defense, so putting more EVs into Defense than HP will result in a higher overall defense.
We have several questions on PokeBase, which should help you find the best spots for EV training in various games. They are split by stat:
The EV system was completely overhauled in Generation III (Ruby/Sapphire). Prior to that, battling a Pokemon would give you Effort Values equal to its stats. For example, Dragonite would give 91 EVs in HP, 134 in Attack and so on.
You could gain up to 65536 EVs in every stat (HP, Attack, Defense, Special and Speed), so you didn't even need to consciously
EV train - you'd normally gain all EVs by the time you reach level 100.
The number of stat points resulting from the EVs was the square root of the EVs divided by 4, meaning that the total number of extra points obtainable was about the same as it is now, 63.
As Pokemon battle, in addition to gaining experience points they also obtain Effort Values (usually referred to as EVs), which are special hidden values in each stat (HP, Attack and so on). Each Pokemon you battle against
gives off EVs in one or more stats.
Generally, this relates to the Pokemon's strongest stat - for example, if you battle a Geodude your Pokemon will get one EV in the Defense stat. If you fight a Gengar, you will get three Special Attack EVs. (See the pages to the left to see which Pokemon give off which EVs.)
Newly-hatched eggs and Pokemon caught in the wild - regardless of level - have no EVs and thus act as a
blank sheet for EV training. Any Pokemon that has gained experience points from battling will have gained some EVs.
Every 4 EVs obtained in a particular stat equals one more point for that stat, by the time that Pokemon reaches level 100. At low levels you may not see all the points added straight away. If your Pokemon is at a high level you will see a lot of additional points going on to the appropriate stats at each level up.
In total a Pokemon can gain 510 EVs, but only 255 in one stat. Since 4 EVs equals one stat point, if you want to max out a particular stat it's only useful to get 252 EVs (63 points). The last 3 EVs would be wasted. However, in practice it's a chore to count exactly how many EVs you have obtained (there's no other way to tell) so you may wish to simply max out a particular stat and forego a point or two.
When you have reached those 510 EVs, you can earn an Effort Ribbon in Diamond/Pearl/Platinum by visiting the woman in the Sunyshore City market. If you have lost count with some stats, this is obviously useful for knowing when to stop EV training!
Battling 252 Bidoofs to max out your HP would be a bit of a bore, no? Luckily, there is an array of items that can help you reach your goal much quicker.
These items, purchaseable from the big department store in each game (Veilstone/Lilycove/Golenrod/Celadon), give your Pokemon 10 EVs in the corresponding stat. Vitamins are not affected by any of the other items below or Pokerus.
There is a limit of 10 per stat, however they only work on the first 100 EVs. If you already gained 90 Attack EVs by battling, you can only use one Protein, not 10. Each costs $9800 in the shops or 1 BP (Battle Point) at the Battle Park. The vitamins are as follows:
Introduced in Black/White, the Wing items raise the corresponding EV by 1 point. However, they are not subject to the same limit as vitamins and can be used for the full 255 EVs if you had that many. The Wings are:
The Macho Brace lowers a Pokemon's speed in battle while held, but doubles the amount of EVs gained. A Starly normally provides 1 Speed EV, but with your Pokemon holding the Macho Brace, it will receive 2 Speed EVs.
Power Items are hold items that will increase the amount of EVs gained per battle. Each relates to a specific stat and will give you 4 additional EVs in that stat. You can get these for 16 BP at the Battle Park.
Battling a Squirtle, for example, normally yields 1 Defense EV. Holding the Power Belt, this is increased to 5. If holding the Power Band, you receive 1 Defense EV and 4 Special Defense EVs.
Since any Pokemon gaining experience points gains EVs, the Exp. Share item allows Pokemon to gain EVs without battling. It will gain the same base EVs that the Pokemon in battle gains. The Pokemon holding Exp. Share will benefit from its own Pokerus (see below), but not from the item or condition of the Pokemon in battle.
Not an item as such, but a so-called
Pokemon Virus. However, this virus is actually beneficial! The chances of catching Pokerus are quite low, and it's not something you can affect yourself. If your Pokemon get the virus, the nurse at the Pokemon Center will inform you and there will be a purple
PKRS on their info screen.
The virus spreads to other Pokemon in your party as they battle, but it will disappear after a Pokemon has been in your party for around 24 hours. Pokemon stored in the PC will keep Pokerus indefinitely.
All Pokemon with Pokerus will receive double EVs, after other calculations with items are taken into account. Even after the virus has gone, the Pokemon will still receive these beneficial effects! (Pokemon who have overcome the virus have a smiley face on their info screen.)
As an example, battling a Luxio gives you 2 Attack EVs. With the Pokerus this is doubled to 4. If it is holding the Macho Brace, this is quadrupled to 8. If it's holding the Power Weight, you'd normally gain 4 HP and 2 Attack EVs, but with Pokerus this is doubled to 8 HP and 4 Attack. And of course, if it was holding the Power Bracer you'd net a huge 12 EVs for one battle!
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